Victor 852A Manuel utilisateur

Contents

Chapter one introduction - - - - - - - - - - - - - - - -2

Chapter two application method - - - - - - - - - - - -4

Chapter three maintenance and overhaul - - - - - - - 13

Accessory one packing list - - - -- - - - - - - - - - - -13

Chapter one introduction

一. Features of instrument:

VICTOR 852A coating thickness gauge is the fruit of high

technology. It applies to the single chip microcomputer technology.

It has high precision, digital display, stable indication and low

power consumption. It can be easily operated and the keys should

be pressed by touch. With a small volume and light weight, it

provides sing probe full range measurement. It also has such

functions as storing, reading, statistic, low-power indication,

system/zero-scale/two-point calibration. Its properties have

reached the international advanced levels of contemporary

instruments of the same kind.

二. Application scope:

This instrument applies to the magnetic thickness gauging method.

It can measure the thickness of non-magnetic coating on

ferromagnetic materials conveniently and without any damage. For

example, it can measure the thickness of the zinc, copper,

chromium, paint, enamel, fiberglass, sprayed plastic, asphalt.etc.

on the surface of steel. This instrument is widely applied in

mechanical, car, shipbuilding, petroleum, chemical, electroplating,

spray plastic, enamel, plastic etc. industries.

三．Working principles:

VICTOR 852A coating thickness gauge applies to electromagnetic

induction method. The probe located on the surface of the

instrument can produce a closed magnetic loop. With the change of

the distance between the probe and the ferromagnetic material, the

magnetic loop will change to different degrees and so the

magnetoresistance and probe coil inductance change. With this

principle, it can accurately measure the distance between the probe

and the ferromagnetic material, that is, the thickness of the coating.

四．Techonoligical parameters:

1.measurement scope: 0~1200um

2.measurement error: <3%±1um

3.minimum indication: 1um

4.display means: liquid crystal display with four digits

5.main functions:

(1)measurement: single- probe full-range measurement

(2)storage and deletion: it can store 254 measured data, delete

some suspicious data and delete all the data that have been stored.

(3)reading: it can read the measured data that have been stored.

(4)statictic: there are three statistical values—the average value,

the maximum value and the minimum value

(5)calibration: zero-scale calibration, two-point calibration and

system calibration

(6)electric quantity: it has the function of displaying low power

(7)buzz indication: there is buzz indication in operation

(8)print: with a micro-printer it can print the measured data

(9)powering off: there are two means of powering

off—automatic powering off and manual powering off

6.power supply: two 1.5v batteries

7.power consumption: the maximum power consumption is

100mw

8.external dimension: 50mm*124mm*24mm

9.weight: 150g( including batteries)

10.environment temperature when it is used: 0 ~+40℃ ℃

relative humidity: less than 90%

11.the minimum thickness of the matrix: 0.2mm

12.the minimum plane of the matrix: 7mm

13.the minimum curvature radius: convex:1.5mm

concave:6mm

14.undervoltage indication: ＂＂ is displayed in the top

right corner

*the critical thickness: when the workpiece iron matrix thickness

is over 1mm, the measurement of the coating thickness won’t be

influenced by the iron matrix thickness.

Chapter two application method

When reading this chapter, one should

combine the instrument with the

attached drawing and acquaint oneself

with the external structure and various

parts of the instrument.

一． Preparation before turning on

the instrument: open the battery

cover according to indication,

put two 1.5v batteries

according to positive and

negative indication and then fix

the battery cover.

二． Names of the keys and

functions

A. "ON/OFF": it is a multiple key. In powering off state, it is

turning-on key; in turning on state, it is powering-off key. When

the instrument is powered off automatically, one should press this

key to turn on the instrument.

B. "MENU": it is menu key.

C. "▲"、"▼" : it is plus/minus multiple key.

D. "CAL": it has the function of calibration/deletion.

E. "ENTER": it is used to confirm one functional state.

三． Application method

1.turning on the instrument: insert the probe wire in the instrument,

then press "ON/OFF" key ( the distance between the probe and the

iron matrix/magnetic field should be over 10cm ). When buzzing

sound is heard, the instrument goes into the state of measurement

and it can measure directly. If the measured data have relatively

large errors, one can operate the iron matrix calibration and then

measure again.

When measuring, one should notice the measurement indication.

As is shown in the right

drawing, only when the

arrow disappears can one

measure again.

2.calibration: this instrument can operate system calibration,

two-point calibration and iron matrix calibration. In general

conditions, one can only operate the iron matrix calibration to

assure accurate measurement. When the instrument iron matrix is

greatly different from the measured workpiece iron matrix in

magnetism and surface roughness, one can operate system

calibration to assure the accuracy of the measurement.

（1）iron matrix calibration

the metal of the instrument standard matrix should be similar to the

metal of the measured workpiece matrix in magnetism and surface

roughness. In order to ensure the accuracy of measurement, iron

calibration can be operated before measuring the workpiece.

Calibration method: after the instrument is turned on, put the probe

on the bare matrix of the measured workpiece to measure twice.

When the second measurement is finished, don’t move the probe.

Press the key of "CAL". When two buzzing sound is heard the

iron matrix calibration is finished. If no buzzing sound is heard,

there is something wrong with the operation. Repeat the

above-mentioned procedures until two buzzing sound is heard.

（2）Two-point calibration

In the process of measurement, if some measured data have

relatively large errors, they can be adjusted through two-point

calibration.

Calibration method:take a workpiece whose thickness has already

been known as the standard workpiece and then measure it. If the

indication is different from its true thickness, keys of " ▲"、"▼

"should be pressed to plus 1 or minus 1. press" ▲"、"▼" keys

without stop can continuously plus or minus until the indication is

the same as its true thickness. When the calibration is finished,

measurement can be operated normally.

Notice: the thickness of measured workpiece in two-point

calibration shouldn’t be close to the five sample values in system

calibration, otherwise operation will be ineffective.

（3）system calibration

before instruments go to market, technicians have already operated

system calibration on them. In order to ensure accuracy, the second

system calibration can also be operated on working site.

The process of system calibration:

In the state of powering off, press the key of "ON/OFF" and

"MENU" key at the same time. Loosen the key of "ON/OFF" first

and then the "MENU" key. Then instrument goes into the mode of

system calibration.

Five sample workpieces need to be calibrated in system calibration.

When instrument displays “iron matrix” screen, the probe should

be put on the bare matrix of the measured workpiece to measure. If

there is nothing wrong with operation, after the second

measurement two buzzing sound will be heard and the instrument

begins to measure the first sample workpiece. The screen displays

the first sample workpiece value. If the indication is different from

the true value, "▲▼"key should be pressed to plus 1 or minus 1.

press"▲″or"▼" keys without stop can continuously plus or

minus until the indication is the same as the true value. After the

sample workpiece value is adjusted, the first sample workpiece can

be measured. If there is nothing wrong with the two measurements,

two buzzing sound can be heard and the next sample workpiece

can be calibrated. If after two measurements there is still no

buzzing sound, it indicates that there is something wrong with the

operation. Then it should be measured once again. The adjustment

method of the following four sample workpieces is similar. When

the fifth sample workpiece is calibrated, the

screen displays “0000” and instrument

enters turning-on interface as is shown in

drawing A. at this time, the instrument has

finished system calibration. Then workpiece

can be directly measured.

Notice: the standard workpiece provided or sample workpieces

whose thickness has already been known can serve as the five

sample workpieces. When sample workpiece is calibrated, it

should be according to the small-to-big order. Certain value

difference should exist between adjacent sample workpieces.

3.storage in the state of measurement

in the state of measurement, the screen displays the latest measured

value. If it needs to be stored, press "ENTER" key and the storage

address plus 1 automatically. For example, if the current address is

0004 and measured

thickness is 1054um, the

storage address will change

to 0005 as is shown in the

drawing.

The measured value displayed on screen can only be stored once.

If it needs to be stored once again, it should be measured once

again. If the data need to be stored from the initial address, press

"ENTER" key under the storage and reading menu for a long time,

then the storage address number will come back to the initial

address 0001, that is to say, the data can be re-stored.

4.the use of menu:

no matter what state it is in, press "MENU" key and instrument

displays four function menu: storage and

reading-----print-----communication----statistic. Press …..key can

adjust the place of the arrow to choose different functions as is

shown in the figure. For example, if

storage and reading function needs to be

set up, press "ENTER" key when the

arrow points to “ storage and reading”.

Then the instrument goes into the state of

storage and reading.

（1）、storage and reading

this instrument can store 254 measured data continuously. Enter

storage and reading menu, one can see the stored data. The content

in different storage part can be displayed through"▲▼"key.

（2）、print

first a printer should be prepared well. Connect the lines, place

printing paper, and plug it into power supply. At this time, both the

red and the green lights are on. If the green light is off, press the

button "SEL" on the printer. If the green light is on, it indicates that

the printer is ready to be used. Connect the printer with the

three-needle plug. According to the red printing tube inserting

needle, insert the plug into the "PCI" interface on the instrument.

When the instrument is in the state of “print”, press key "▲"and

instrument begins to print. Press "▼"key for a long time, the

printing can be stopped.

（3）、Communication

open communication software and “ open serial port” on the

software. The other settings are all default settings. When the

instrument is in the state of communication, press "▲"key and

instrument beginns to communicate. Press "▼"key for a long time

and communication can be stopped.

（4）、statistic

in order to effectively analyze measured data, this instrument has

the function of data statistic. In statistic menu, the maximum value,

the minimum value and the average value of measured data can be

displayed. In the state of measurement, the screen displays the

newly measured data. The instrument stores measured data

automatically. The number that is displayed behind S on the top of

the screen is the number of data that have entered statistic. In order

to ensure the validity of statistical data, the average value will not

be shown when measurements have been operated for fewer than

eight times. When measurements have been operated for more than

eight times, only the last eight data will enter statistic.

In the process of measurement, if some data have relatively large

errors, one can remove probe and press "CAL" key in

non-measurement state to delete to prevent the data enter statistical

calculation. At this time, the screen displays “0000um”, that means,

the instrument can measure data again. If the instrument measures

directly in the state of statistic, it can rerurn to the state of

measurement.

四． Notice:

（1）when the curvature radius of the measured curved surface or

cylinder is relatively small, the instrument should be calibrated on

uncoated workpiece to ensure accuracy of measurement.

（2）When it measures concave with a relatively small radius, the

instrument should be calibrated again.

五． Some factors that may influence measurement

The magnetism of the matrix metal

Magnetic thickness measuring is influenced by the change in

magnetism of the matrix metal ( in practical application, the

change of magnetism of low carbon steel can be regarded very

light). In order to prevent the influence of heat treatment or cold

working etc. the instrument should be calibrated on iron matrix

that have the same properties as the coated metal.

The thickness of matrix metal

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